navigatoru Posted July 27, 2015 Report Share Posted July 27, 2015 Hi guys, I have an IO-ATC8/AI8IO module, connected to a V1210 PLC. I am trying to read the values from a humidity sensor which has the output 0-3V in an AI0 of the above module. The AI0 is configured as 0-10V Type, No Filter, Normal Mode. I am reading this value in a MI10 operand. The issue is that I am reading in PLC the following values: 5 or 6. Reading with a voltmeter directly from the sensor's output, I am able to read the output voltage values properly (0-3V, and changing the humidity around the sensor, the voltage read with the voltmeter is changing accordingly). Do you have any idea why I am not able to read the proper voltage value in my PLC? Cheers, Marius Link to comment Share on other sites More sharing options...
cantcliff Posted July 27, 2015 Report Share Posted July 27, 2015 Do you have a linearize function for the operand? Does the input value change as well or does it always read 5 or 6? Is it possible that the wiring is incorrect? Link to comment Share on other sites More sharing options...
Damian Posted July 27, 2015 Report Share Posted July 27, 2015 Jumper settings? Wiring and common connection? MI10 overwritten somewhere else in program? Link to comment Share on other sites More sharing options...
navigatoru Posted August 4, 2015 Author Report Share Posted August 4, 2015 Hi Cantcliff / Damian, Thank you for your input. It helped me to find the issue. First one it was the jumper settings in the AIO module. Second one it was a loose connection between sensor and AIO module. Now, I am able to read values in the PLC. Unfortunately, the PLC is reading a value of 1234 when I am reading with a voltmeter from the sensor a value of 2.999V and a value of 648 when I am reading with voltmeter from the sensor a value of 1.566V. The output range of the sensor is between 0-3V. The AI Mode is configured on Fast. Not sure if in the PLC I have to read exactly the values that I am reading with the voltmeter, or the PLC is doing some sort of scaling for the analogue inputs? Appreciate your input. Cheers, Marius Later edit: I watched the webinars regarding the linearization and I found what happened. The PLC is doing the linearization (scaling) between what is reading from sensor and internal bits of the PLC. I am doing a new linearization and I got my values - the real humidity Cheers, Marius Link to comment Share on other sites More sharing options...
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